i recently bought a new scope for my first gun, a model 700 .270, and am planning on using it for our annual speedgoat and muley hunt. I want to get a new load for it though being as all i have now is 150 grainers i used to use for elk. are the 100-grain bullets adequate for a big muley at 400 yards or do i want to stick with something in the 130 weight?